Dic: An event goes off well

• The show went off very well.
• How did the concert go off?
• The performance went off without a hitch(=without any problems at all).
• The meeting went off all right.
• The project went off smoothly.

1. [+ adv] if a performance, etc. (goes off) well/badly, it is successful/not successful

2. PHRASAL VERB | If you say how an organized event went off, you are saying whether everything happened in the way that was planned or hoped.

3. Informal | To adhere to the expected course of events or the expected plan.

.... OALD, Cobuild, The American Heritage

cf. of, off on

cf. go off the deep end